关键词: 应变强化, 真空绝热容器, 环氧玻璃钢管, Tsai-Hill强度理论

Abstract: Epoxy glass fiber reinforced plastic(Epoxy-GFRP) tube was designed in accordance with the engineering experience currently,but it was lacking of systematic study. In order to effectively evaluate the safety of Epoxy-GFRP tube support structure and to design and check it reasonably,the numerical simulation and experimental research was carried out in this paper. At first,low temperature mechanical properties test of Epoxy-GFRP material was carried out according to the test methods of GFRP properties. Then the vessel was simulated by using nonlinear finite element method,taking the strain-strengthening transportable vacuum insulated vessel as research object and considering the different transportation environment. Epoxy-GFRP tube was checked by using the Tsai-Hill strength theory. Experimental results showed that Epoxy-GFRP material has good compressive properties in low temperature environment,but low shear resistance. The simulation results showed that Mises equivalent stress of support structure was larger than that of other conditions when low temperature liquid tanker suffers bumper-to-bumper traffic conditions in the process of actual transportation. The Mises equivalent stress of Epoxy-GFRP tube near the fixed end support in the lower vessel was larger than that of other locations under different conditions. As the strain-strengthening transportable vacuum insulated vessel's main support structure,Epoxy-GFRP tube conforms to the requirements of transportation safety that its intensity checking value is far less than one under different conditions.

Key words: strain strengthening, vacuum insulated vessel, Epoxy-GFRP tube, Tsai-Hill strength theory